 Fuel models were at the core of these calculations, with each of its 20 models containing information about the relative loading of different fuel components.Each model is described by the volume of 1-hr, 10-hr, 100-hr, and 1000-hr dead fuels, herbaceous and woody live fuels present as well as the fuel bed depth and moisture of extinction.The ‘original 13 fuel models’ were presented first by Albini in 1976 and later expanded upon by Anderson in 1982.